The ex-fiancé of an Upper East Side hairdresser claims she won’t buy him out of their co-op — more than 11 years after they split, according to a new lawsuit.

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Lars Magnusson and Alice McCarney jointly bought a co-op on East 93rd St. at First Ave. in 2005 when they were engaged.

Magnusson, who now lives in Idaho running pheasant and partridge hunts, claims in his Manhattan Supreme Court sure it that their relationship started to sour about one year later.

Magnusson, who had lived in the co-op alone doing renovations, decided to move out in March 2006.

McCarney then moved in “with the understanding that if the parties' relationship could not be saved, they would either sell the Apartment or one would buyout the other's fifty percent (50%) interest,” the suit states.

“Ultimately, the parties' relationship was not saved and their engagement was formally called off in or about February 2007,” court papers state, but McCarney “has continued to reside in the Apartment since that time.”

While Magnusson paid all bills associated with the co-op while he lived there, McCarney has claimed she covered the mortgage and maintenance fees after his departure.

Magnusson has told his former flame over and over again that he doesn’t want to own a co-op with her.

While McCarney, 48, has “repeatedly promised” to buy Magnusson’s stake, she hasn’t done so — and took his name off the doorman’s visitor list, the suit claims.

He wants a court to make McCarney sell the apartment and then divide the money between them.

Magnusson’s lawyer declined to comment.

McCarney did not respond to requests for comment.

A woman who identified herself as McCarney’s business and life partner said, “This is really hilarious, because the apartment is being appraised on Saturday.”